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Find the electron density when convection current density is 120 units and the velocity is 5m/s.

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Find the electron density when convection current density is 120 units and the velocity is 5m/s.

(a) 12

(b) 600

(c) 24

(d) 720

I got this question during an online exam.

This is a very interesting question from Continuity Equation in section Electric Fields in Material Space of Electromagnetic Theory

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Correct answer is (c) 24

For explanation I would say: The convection current density is given by J = ρe x v. To get ρe, put J = 120 and v = 5. ρe = 120/5 = 24 units.

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